"In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as disk of confusion, circle of indistinctness, blur circle, or blur spot." - Wikipedia, free Dictionary, I have given examples of this in my book.
Orbs in our photographs can indeed be circles of 'confusion'.
I am thinking that whatever energy these circles of light are we are not really 'seeing" the subject - whether or not it is a reflection from an earth-form, or an energy unseen by the naked eye, such as spirits or entities from other dimensions. We are seeing only what the particular camera 'sees'.
I have also found that different cameras have different ways of 'seeing' (recording orb images on their sensors). They can be recorded as varying shapes - eg: hexagon, pentagon, diamond (I have also mentioned this in my book) depending on the diaphragm of the particular camera. It appears that there are also different patterns on the orbs because of the differences between the many makes and models of cameras. There are also similarities, which is another subject.
I have had some amazing insights and discoveries into the phenomenon by not particularly labeling the orbs - being open-minded.
I will follow this post up with another example of some very magical and angelical orbs.
Love to all!!